Diachronic Surveys, exploring the history of such alternations as fish/fish/fishes,person/persons/people/peoples,mouse/mice/mouses/mices, and thank/thanks/thanx/thanxes.

Synchronic Explorations, surveying the current useses and meaningses of double pluralses in several diverse dialectses of English.

Spirited Discussion, including the proceedings of the Multiple Plurals Roundtable Discussion Group Conference, MPRDG-Con XIX: Pocketses: Gollum, the Lord of the Rings, and the Sociolinguistic Status of MP on the Upswing

Heated Debate, including sharp point/counterpoint exchanges
in which the editors debate the merits of their preferred
interpretations of the triply plural form childrens (child + [e]r(pl.) + en(pl.) + s(pl.)):

Children, like cats, are more emphatically plural than
most ordinary nouns. Two children are much more than twice as much work
to care for as one, and four much more than twice two. I expect to see
in the future forms like childrenses with four or more plural markers, as speakers continue to subconsciously grammaticalize this exponential plurality of young humans.

Plural marking is binary, not additive or absolute--that is, speakers use plural markers to toggle plurality. Thus, native speakers instinctively compute that doubly plural children is, logically, no more plural than unpluralized child and so move to correct the situation.

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